stainless steel, ball snap closure, w/ teeth Cervical Retractor Medial Blade is an added component to be used alongside the cervical retractor for medial retraction. All five blades are made from stainless steel and a ball snap closure making them a tight fit. Each blade also features teeth that are variety in their size and curvature making it possible to find a suitable blade for soft tissue retraction in a number of neurosurgical scenarios and approaches to the spinal cord.